diff --git a/Software/co2ampel/data/config.json b/Software/co2ampel/data/config.json
index 1a18e1f..edcbba0 100644
--- a/Software/co2ampel/data/config.json
+++ b/Software/co2ampel/data/config.json
@@ -18,5 +18,6 @@
   "th_red": 2000,
   "selftest_buzzer": 0,
   "led_brightness": 128,
-  "version": "1"
+  "calibration_ppm": 450,
+  "version": "3"
 }